public bool ChangeReceived(string sessionKey, int clientRevisionId, string selStr, string changeStr)
{
try
{
lock (lockObject)
{
var sess = sessions.Find(x => x.SessionKey == sessionKey);
if (sess == null)
{
return(false);
}
sess.LastActiveUtc = DateTime.UtcNow;
ensureDocLoaded(sess.DocId);
var doc = docs.Find(x => x.DocId == sess.DocId);
if (doc == null)
{
return(false);
}
var sel = JsonConvert.DeserializeObject <Selection>(selStr);
ChangeSet cs = changeStr != null?ChangeSet.FromJson(changeStr) : null;
logger.Verbose("Change received from session {sessionKey}: client rev {clientRevisionId}, sel: {sel} , change: \n{change}",
sessionKey, clientRevisionId, selStr, changeStr);
// Who are we broadcasting to?
List <string> receivers = new List <string>();
foreach (var x in sessions)
{
if (x.RequestedUtc == DateTime.MinValue && x.DocId == doc.DocId)
{
receivers.Add(x.SessionKey);
}
}
// What are we broadcasting?
ChangeToBroadcast ctb = new ChangeToBroadcast
{
SourceSessionKey = sessionKey,
SourceBaseDocRevisionId = clientRevisionId,
NewDocRevisionId = doc.Revisions.Count - 1,
ReceiverSessionKeys = receivers,
};
// This is only about a changed selection
if (cs == null)
{
sess.Selection = doc.ForwardSelection(sel, clientRevisionId);
ctb.SelJson = JsonConvert.SerializeObject(getDocSels(sess.DocId));
logger.Verbose("Propagating selection update: {sels}", ctb.SelJson);
}
// We got us a real change set
else
{
if (!cs.IsValid())
{
logger.Warning("Change is invalid. Ending this session.");
return(false);
}
ChangeSet csToProp;
doc.ApplyChange(cs, sel, clientRevisionId, out csToProp, out sess.Selection);
ctb.NewDocRevisionId = doc.Revisions.Count - 1;
ctb.SelJson = JsonConvert.SerializeObject(getDocSels(sess.DocId));
ctb.ChangeJson = csToProp.SerializeJson();
logger.Verbose("Propagating changeset and selection update:\n{change}\n{sels}", ctb.ChangeJson, ctb.SelJson);
}
// Showtime!
Broadcaster.EnqueueChangeForBroadcast(ctb);
}
return(true);
}
catch (Exception ex)
{
logger.Error(ex, "Error in ChangeReceived");
throw;
}
}